JP2011011265A - Apparatus and method for cutting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting apparatus and a cutting method, capable of significantly improving productivity by biting an end of a continuously running sheet-like workpiece at uneven pitches.SOLUTION: The cutting apparatus including a feed roll rotating, while following running of the sheet-like workpiece and a cylindrical knife roll disposed at a position facing the feed roll through the sheet-like workpiece, further includes: a biting mechanism that has portions with and without a cutting edge for biting the sheet-like workpiece in a predetermined cutting pattern on an outer periphery of the knife roll and bites the sheet-like workpiece in the predetermined cutting pattern by making the knife roll follow the sheet-like workpiece for rotating; and a mechanism for stopping the knife roll to idle-feed the sheet-like workpiece at the portion without the cutting edge. The cutting method uses the cutting apparatus.

Description

  The present invention relates to a cutting device and a cutting method for cutting into an end portion of a continuously traveling sheet.

  Conventionally, an electrode body of a power generation element used for a wound-type lithium ion battery or the like is a negative electrode of an aluminum thin film in which an active material containing a carbonaceous material is applied on both front and back surfaces, and a porous polypropylene sheet. Created by winding a separator and a copper thin film positive electrode coated with an active substance containing lithium nickel oxide or lithium cobalt oxide on both the front and back sides in a spiral fashion so that the positive electrode is placed on the outermost periphery Has been.

  In these manufacturing processes, the negative electrode of the aluminum thin film and the positive electrode of the copper thin film coated with the active substance on both the front and back surfaces are supplied as a sheet-like work, and the end of the sheet-like work forms a tab that is an electrode. There is a notch. The sheet-like workpiece is wound in a spiral shape, and tabs as electrodes are collected in one place. For this reason, the positions where the tabs are cut are not formed at equal pitches, but the pitches of adjacent tabs are gradually widened in consideration of the thickening due to winding of the sheet-like workpiece. Specifically, in consideration of the thickness of the sheet-like workpiece and the interval between the sheet-like workpiece and the separator during winding, the tab cutting pitch is varied in accordance with the winding thickness.

JP 2007-44808 A

  For this reason, the tab is cut by using a Thomson blade or the like while intermittently feeding the sheet-like workpiece by a predetermined length. Since a cut is made with a Thomson blade or the like on a stationary sheet-like workpiece, there is an advantage that the quality of burrs and burrs on the cut surface is improved. However, there is a problem that production efficiency cannot be increased by intermittent feeding.

  On the other hand, an apparatus as disclosed in Patent Document 1 is disclosed as an apparatus that continuously cuts an end while running a sheet-like workpiece. In Patent Document 1, a cutting blade along the circumferential direction is provided on the outer peripheral surface of the roller, and the roller is rotated following the traveling of the sheet-like workpiece to make a cut. However, in the apparatus having such a configuration, it is possible to perform regular continuous cuts at equal pitches, but it is not possible to perform cut patterns at unequal pitches.

  Accordingly, an object of the present invention is to provide a cutting apparatus and a cutting method capable of cutting the edges of sheet-like workpieces that run continuously at an unequal pitch and greatly improving productivity. .

In order to solve the above problems, the invention described in claim 1
A cutting device for making a cut at the end of a sheet-like workpiece that runs continuously,
A feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll disposed at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, a blade part for cutting a predetermined cut pattern into the sheet-like workpiece, and a part without the blade are provided,
A cutting mechanism comprising: a mechanism in which the knife roll is rotated following the sheet-like workpiece to make a cut of a predetermined cut pattern; and a mechanism in which the knife roll is stopped and the sheet-like workpiece is idled at a portion without a blade. Device.

The invention described in claim 2
It is a cutting device of Claim 1 provided with the timing adjustment unit which adjusts the timing which rotates the said knife roll following a sheet-like workpiece | work, and the timing which stops the said knife roll.

The invention according to claim 3
A cutting device that performs cutting by alternately operating at least two sets of cutter units at the end of a sheet-like workpiece that continuously travels,
The cutter unit includes a feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll disposed at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, there are provided a blade portion for cutting a predetermined cut pattern at the end of the sheet-like workpiece, and a portion having no blade on the outer periphery,
A mechanism for cutting the predetermined cut pattern by rotating the knife roll following the sheet-like workpiece, and a mechanism for stopping the knife roll and feeding the sheet-like workpiece at a portion without a blade,
A timing adjustment unit for adjusting the timing of rotating the knife roll following the sheet-like workpiece and the timing of stopping the knife roll;
The timing at which a predetermined cut pattern is cut into the edge of the sheet-like workpiece with one cutter unit, and the cut pattern with a predetermined cut pattern is cut into the portion where the sheet-like workpiece is not cut in the other cutter unit. Is a cutting device provided with a phase adjustment unit for adjusting the timing.

The invention according to claim 4
The cutting device according to any one of claims 1 to 3, wherein the predetermined cut pattern has a convex shape.

The invention described in claim 5
A cutting method that uses a cutting device to cut into the end of a sheet-like workpiece that runs continuously,
The cutting device includes a feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll disposed at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, there are provided a blade portion for cutting a predetermined cut pattern at the end of the sheet-like workpiece, and a portion having no blade on the outer periphery,
Cutting the predetermined cut pattern by rotating the knife roll following the sheet-like workpiece; and
A step of stopping the knife roll and causing the sheet-like workpiece to be idle fed at a portion having no blade on the outer periphery.

The invention described in claim 6
A cutting method that uses a cutting device to cut into the end of a sheet-like workpiece that runs continuously,
The cutting device is composed of at least two sets of cutter units,
The cutter unit includes a feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll disposed at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, there are provided a blade portion for cutting a predetermined cut pattern at the end of the sheet-like workpiece, and a portion having no blade on the outer periphery,
A step of cutting a predetermined cut pattern at the edge of the sheet-like workpiece with one cutter unit;
The other cutter unit has a step of cutting a predetermined cut pattern into a place where the sheet-like workpiece is not cut or adding a cut.

The invention described in claim 7
The cutting method according to claim 5 or 6, wherein the predetermined cut pattern is a convex shape.

  According to the first aspect of the present invention, the cylindrical knife roll and the feed roll are rotated following the sheet-like workpiece, and a predetermined cut pattern is cut into the continuously running sheet-like workpiece. I can put it in. Then, the sheet-like workpiece travels without being cut by feeding the sheet-like workpiece at the portion where the blade of the knife roll is not provided.

  Therefore, a predetermined cut pattern can be cut at an arbitrary pitch by changing the time during which the sheet-like workpiece is fed idle.

  According to the second aspect of the invention, the blade of the knife roll is provided with the timing adjustment unit that adjusts the timing of rotating the knife roll following the sheet-like workpiece and the timing of stopping the knife roll. It is possible to adjust the time during which the sheet-like workpiece is idle-fed by a portion having no mark.

  Therefore, by providing such a timing adjustment unit, it is possible to cut a predetermined cut pattern at an unequal pitch at the end of the sheet-like workpiece. In consideration of the thickness of the sheet-like workpiece and the interval between the sheet-like workpiece and the separator during winding, the cutting pitch of the predetermined cut pattern can be varied according to the winding thickness.

  According to the invention described in claim 3, at least two sets of cutter units are provided in the traveling direction of the sheet-like workpiece that continuously travels, and the one set of cutter units includes a cylindrical knife roll and a feed roll. Since it consists of a timing adjustment unit, it is possible to cut a predetermined cut pattern at an unequal pitch into a sheet-like workpiece that is continuously running. Adjust the timing so that cutting is performed with one cutter unit, and the cut pattern is cut into the uncut portion where the sheet-like workpiece is fed by the other cutter unit. By providing the phase adjustment unit that performs this, it is possible to cut a predetermined cut pattern continuously at an unequal pitch at the end of the sheet-like workpiece.

  Accordingly, the sheet-like workpiece is continuously run while the predetermined cut pattern is cut at an unequal pitch, so that the productivity is greatly increased.

  According to the invention described in claim 4, since the cut pattern has a convex shape, in the manufacturing process of the secondary battery, the sheet used for the negative electrode of the aluminum thin film coated with the active material on both the front and back surfaces, or the positive electrode of the copper thin film Can be suitably used for cutting a tab formed at the end of a workpiece. The predetermined cut pattern may be, for example, a convex shape, a round shape, a square shape, a concave shape, or a shape in which the convex portion or the concave portion is a triangle.

  According to the fifth aspect of the present invention, the cylindrical knife roll and the feed roll are rotated following the sheet-like workpiece, and a predetermined cut pattern is cut into the continuously running sheet-like workpiece. I can put it in. Then, the sheet-like workpiece travels without being cut by feeding the sheet-like workpiece at the portion where the blade of the knife roll is not provided. Therefore, a predetermined cut pattern can be cut at an unequal pitch at the end of the sheet-like workpiece by adjusting the interval at which the sheet-like workpiece is not cut.

  According to the sixth aspect of the present invention, a predetermined cut pattern is formed in a portion where the cut is made by one cutter unit and the sheet-like workpiece is idle fed by the other cutter unit. Since the cut is made, it is possible to make a cut of a predetermined cut pattern at an unequal pitch continuously at the end of the sheet-like workpiece.

  According to the invention of claim 7, since the cut pattern has a convex shape, in the manufacturing process of the secondary battery, the sheet used for the negative electrode of the aluminum thin film coated with the active material on both the front and back surfaces and the positive electrode of the copper thin film Can be suitably used for cutting a tab formed at the end of a workpiece. The predetermined cut pattern may be, for example, a convex shape, a round shape, a square shape, a concave shape, or a shape in which the convex portion or the concave portion is a triangle.

It is a perspective view explaining the cutting device of a 1st embodiment of the present invention. It is a side view explaining the relationship between a feed roll and a knife roll. It is a figure explaining the state which cut in the sheet-like workpiece | work. It is a perspective view of the cutting device which comprised the timing adjustment unit with the clutch and the cam mechanism. It is a perspective view explaining the cutting device of the 2nd Embodiment of this invention. It is a figure explaining the state which cut in the sheet-like workpiece | work.

  The first embodiment of the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic perspective view of a cutting device 1 according to a first embodiment of the present invention. The front direction toward the cutting device 1 is defined as the X axis, the lateral direction is defined as the Y axis, and an axis orthogonal to the XY plane constituted by the X axis and the Y axis is defined as the Z axis.

  The cutting device 1 includes a support plate 10, a feed roll 11 and a knife roll 12 arranged in the X + direction with respect to the support plate 10, and a feed roll 11 arranged in the X− direction with respect to the support plate 10. A driving motor 13 for driving and a timing adjusting unit 14 for driving the knife roll 12 are configured.

  The support plate 10 supports the drive motor 13 and the timing adjustment unit 14. The support plate 10 is provided with two through holes (not shown), and a drive shaft 15 connected to the drive motor 13 passes through one of the through holes. The drive shaft 16 connected to the timing adjustment unit 14 passes through the other through hole. A feed roll 11 is connected to the drive shaft 15 and is driven by a drive motor 13. The drive shaft 16 is connected to the knife roll 12, and the drive timing is adjusted by the timing adjustment unit 14.

  The feed roll 11 is a cylindrical roll and is rotationally driven by a drive motor 13. The peripheral speed of the outer periphery of the feed roll 11 is the same as the traveling speed V of the sheet-like workpiece 2. The blade 17 provided on the outer periphery of the knife roll 12 disposed at the opposite position on the roll surface of the feed roll 11 is received, and the sheet-like workpiece 2 is pushed and cut by the blade 17 to make a cut. (Note that the knife roll 12 is also rotated at the same speed as the feed roll 11 when it is pushed through.) As a result, the cut surface of the sheet-like workpiece 2 is maintained with good quality free from burrs and burrs. It has become. Further, the peripheral speed of the feed roll 11 is set to the same speed as that of the sheet-like workpiece 2 so that no wrinkles or pulls are generated when the cut is made.

  A blade 17 is arranged on the outer periphery of the knife roll 12 in a convex shape. Further, a portion 18 without a blade is provided on the outer periphery of the knife roll 12. In the present embodiment, an example is shown in which four convex blades 17 and a portion 18 without four blades are provided on the outer periphery of the knife roll 12. There may be at least one portion 18 without a blade according to the cut shape.

  The relationship among the feed roll 11, the knife roll 12, and the sheet-like workpiece 2 is shown in the side view of FIG. As shown in FIG. 2, in the knife roll 12, the diameter r1 of the portion with the blade 17 and the diameter r2 of the portion 18 without the blade have a relationship of r1> r2. Further, the portion 18 without the blade of the knife roll 12 corresponds to the travel distance L of the sheet-like workpiece 2. In FIG. 2, the sheet-like workpiece 2 is traveling at a speed V. In contrast, the feed roll 11 rotates in the A direction, and the knife roll 12 disposed so as to face the same rotates in the B direction at the same speed as the feed roll 11. FIG. 3A shows a cut pattern of the sheet-like workpiece 2 when rotated by a quarter turn. As shown in FIG. 3A, the length L corresponding to the portion 18 having no blade on the circumference of the knife roll 12 is not cut. The cut of the convex cut pattern enters the sheet-like workpiece 2 at the portion where the blade 17 of the knife roll 12 is present.

  Next, a description will be given of a cut pattern when rotation of the knife roll 12 in the B direction is temporarily stopped when the blade-less portion 18 of the knife roll 12 is arranged on the sheet-like workpiece side (position shown in FIG. 2). To do. The sheet-like work 2 passes at a speed V without contacting the blade 17 between the bladeless portion 18 of the knife roll 12 and the feed roll 11. A cut pattern of the sheet-like workpiece 2 at this time is shown in FIG. As shown in FIG. 3 (b), the sheet-like workpiece 2 has a length L corresponding to the portion 18 without the blade and a length of the sheet-like workpiece 2 that passes during the rotation stop time T of the knife roll 12. No cut is made by Lt.

  The timing adjustment unit 14 for driving the knife roll 12 can adjust the rotation stop time T of the knife roll 12 and the timing at which the bladeless portion 18 of the knife roll 12 is arranged on the sheet-like workpiece 2 side. Yes. Therefore, the use of the timing adjustment unit 14 makes it possible to cut the convex cut pattern into the sheet-like workpiece 2 at an unequal pitch.

  Returning to FIG. 1, in the present embodiment, convex cuts are made on both sides with respect to the traveling direction (Y-axis direction) of the sheet-like workpiece 2, so that the front side and the back side (X-axis + side) of the knife roll 12. And the minus side) are provided with a blade 17 and a blade-free portion 18 of the knife roll 12. Note that the blade 17 and the blade-free portion 18 provided on the knife roll 12 are appropriately changed depending on the arrangement of the tabs of the secondary battery to be the product. For example, when a convex cut pattern is placed only on one side of the sheet-like workpiece 2, the blade 17 and the portion 18 without the blade are provided only on the front side or the back side of the knife roll 12.

  In the present embodiment, an example in which the timing adjustment unit 14 is configured by a servo motor 40 will be described as shown in FIG. The servo motor 40 is connected to a shaft 16 that drives the knife roll 12, and controls the rotation and stop of the knife roll 12. As shown in FIG. 2, when the portion 18 without the blade of the knife roll 12 is arranged on the sheet-like workpiece 2 side, it is controlled to stop for a predetermined stop time T. By controlling the stop time T of the servo motor 40, it is possible to make cuts with unequal pitches in the sheet workpiece 2. By setting the stop time T to zero (0), the knife roll 12 can be continuously rotated without stopping. In this case, the cuts entering the sheet-like workpiece 2 are at equal pitches.

  FIG. 4 shows an example in which the timing adjustment unit 14 is configured using a clutch 22 and a cam mechanism 29. The drive shaft 15 connected to the feed roll 11 is provided with a gear 20. The gear 20 meshes with a gear 21 provided in the timing adjustment unit 14 and rotates the clutch 22. In the timing adjustment unit 14, a clutch coupling motor 28 is coupled to a cam mechanism 29 via a coupling 27. The cam mechanism 29 operates in accordance with the rotation timing of the clutch coupling motor 28, and the clutch 22 couples the drive shaft 16 of the knife roll 18 and the drive shaft 15 of the drive motor 13 via the gear 20 and the gear 21. Like to do. Further, the clutch 22 is disconnected and the knife roll 12 is stopped by the rotation timing of the clutch connecting motor 28. The timing adjustment unit 14 may be configured by using the clutch 22 and the cam mechanism 29 as described above. Since the knife roll 12 is mechanically rotated and stopped, the timing adjustment unit 14 is excellent in durability.

  Using the cutting device 1 having the above-described configuration, convex cuts can be made at both ends of the sheet-like workpiece 2 at unequal pitches. It should be noted that convex cuts may be made at unequal pitches on only one side of the sheet-like workpiece 2 by arranging the blade 17 and the blade-free portion 18 provided on the knife roll 12.

  Next, a second embodiment of the present invention will be described with reference to the drawings.

[Second Embodiment]
FIG. 5 is a schematic perspective view of the cutting device 100 according to the second embodiment of the present invention. The cutting device 100 is configured to include two cutting devices 1 described in the first embodiment in the traveling direction of the sheet-like workpiece 2 that continuously travels. Hereinafter, the cutting device 1 is referred to as a cutter unit, which are referred to as a cutter unit Ca and a cutter unit Cb. The cutting device 100 includes a phase adjustment unit 50 that adjusts the timings of the timing adjustment units 14a and 14b of the cutter units Ca and Cb. The phase adjustment unit 50 adjusts the timing of cutting the convex cut pattern continuously into the sheet-like workpiece 2 from the traveling speed V of the sheet-like workpiece 2 and the distance D between the cutter units Ca, Cb. The sheet-like work 2 travels continuously from the cutter unit Ca side to the cutter unit Cb side.

  Note that the convex blades 17a and 17b will be described by taking one side of the sheet-like workpiece 2 as an example and dividing it into a protruding portion 31 and a flat portion 32. The knife rolls 12a and 12b for cutting the sheet-like workpiece 2 are configured such that the flat portions 32 provided on the blades 17a and 17b are on the same line.

  FIG. 6 shows the state of the cut pattern with adjusted timing. For the sake of explanation, the cut pattern cut by the cutter unit Ca is shown on the upper side of FIG. 6A, and the cut pattern cut by the cutter unit Cb is shown on the lower side of FIG. 6A. The timing adjustment units 14a and 14b of the cutter units Ca and Cb continuously rotate the knife rolls 12a and 12b (when the blade-free portions 18a and 18b are arranged on the sheet-like workpiece 2 side, the knife roll 12a and 12b are not stopped).

  In the phase adjustment unit 50, the blade 17b and the bladeless portion 18b of the knife roll 12b of the cutter unit Cb are formed in the state where the upper cut pattern of FIG. 6A is formed by the knife roll 12a of the cutter unit Ca. (A) The timing is adjusted so that the lower timing is reached (the timing of the blade of 17b comes to the portion of 18a where the cut is not made). Specifically, the cutter unit Ca cuts a convex cut pattern, and the timing is set so that the protruding portion 31 of the convex blade 17b of the cutter unit Cb corresponds to the non-blade portion 18a of the cutter unit Ca. adjust. Then, the flat portion 32 of the blade 17a of the cutter unit Ca and the flat portion 32 of the blade 17b of the cutter unit Cb are cut into the same portion, and further, the flat portion is continuously projected as shown in FIG. 6 (b). A cut of the shape cut pattern is formed.

  Next, the case where the stop time T is set in the timing adjustment units 14a and 14b of the cutter units Ca and Cb will be described with reference to FIG. The blades 17a and 17b of the cutter units Ca and Cb and the portions 18a and 18b having no blade cut the convex cut pattern into the sheet-like workpiece 2. The portions 18a and 18b that are not cut are only the travel distance Lt of the sheet-like workpiece 2 that travels from the set stop time T to the length of the knife rolls 12a and 12b of the portions 18a and 18b without the blade and the stop time T. There is no cut. After cutting the convex cut pattern with the blade 17a of the knife roll 12a of the cutter unit Ca, the sheet-like workpiece is idle fed with the blade-free portion 18a, and the center of L + Lt of the cutter roll Cb of the cutter unit Cb. The timing of the phase adjustment unit 50 is adjusted so that the protruding portion 31 of the blade 17b is disposed. Then, the flat portion 32 of the blade 17a of the cutter unit Ca and the flat portion 32 of the blade 17b of the cutter unit Cb are partially cut into the same portion, and further, a continuous protrusion as shown in FIG. A cut of the shape cut pattern is formed. The pitch of the convex cut pattern formed in FIG. 6D is formed to be larger by Lt / 2 than the pitch of the convex shape shown in FIG. 6B.

  In this way, by adjusting the timing of cutting the cut units Ca and Cb using the phase adjustment unit 50, it is possible to cut the convex cut pattern into the sheet-like workpiece 2 at an unequal pitch. become.

  In the embodiment of the present invention, the cutter unit Ca, Cb is used to form a cut-shaped cut pattern with an unequal pitch. For example, three or more cutter units are used, A cut pattern may be placed in the sheet-like workpiece 2.

DESCRIPTION OF SYMBOLS 1 Cutting apparatus 2 Sheet | seat workpiece | work 10,10a, 10b Support plate 11,11a, 11b Feed roll 12,12a, 12b Knife roll 13,13a, 13b Drive motor 14,14a, 14b Timing adjustment unit 15 Drive shaft 16 Drive shaft 17 , 17a, 17b Blade 18, 18a, 18b Bladeless portion 20 Gear 21 Gear 22 Clutch 27 Coupling 28 Clutch coupling motor 29 Cam mechanism 31 Protruding portion 32 Flat portion 40 Servo motor 50 Phase adjustment unit 100 Cutting device Ca, Cb Cutter unit

Claims (7)

A cutting device for making a cut at the end of a sheet-like workpiece that runs continuously,
A feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll arranged at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, a blade part for cutting a predetermined cut pattern into the sheet-like workpiece, and a part without the blade are provided,
A cutting mechanism comprising: a mechanism in which the knife roll is rotated following the sheet-like work to make a cut of a predetermined cut pattern; and a mechanism in which the knife roll is stopped and the sheet-like work is idled at a portion without a blade. apparatus. The cutting device according to claim 1, further comprising a timing adjustment unit that adjusts a timing of rotating the knife roll following the sheet-like workpiece and a timing of stopping the knife roll. A cutting device that performs cutting by alternately operating at least two sets of cutter units at the end of a sheet-like workpiece that continuously travels,
The cutter unit includes a feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll disposed at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, there are provided a blade portion for cutting a predetermined cut pattern at the end of the sheet-like workpiece, and a portion having no blade on the outer periphery,
A mechanism for cutting the predetermined cut pattern by rotating the knife roll following the sheet-like workpiece, and a mechanism for stopping the knife roll and feeding the sheet-like workpiece at a portion without a blade,
A timing adjustment unit for adjusting the timing of rotating the knife roll following the sheet-like workpiece and the timing of stopping the knife roll;
The timing at which a predetermined cut pattern is cut into the edge of the sheet-like workpiece with one cutter unit, and the cut pattern with a predetermined cut pattern is cut into the portion where the sheet-like workpiece is not cut in the other cutter unit. A cutting device including a phase adjustment unit that adjusts timing. The cutting device according to any one of claims 1 to 3, wherein the predetermined cut pattern has a convex shape. A cutting method that uses a cutting device to cut into the end of a sheet-like workpiece that runs continuously,
The cutting device includes a feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll disposed at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, there are provided a blade portion for cutting a predetermined cut pattern at the end of the sheet-like workpiece, and a portion having no blade on the outer periphery,
Cutting the predetermined cut pattern by rotating the knife roll following the sheet-like workpiece; and
A step of stopping the knife roll and causing the sheet-like workpiece to be fed idle at a portion having no blade on the outer periphery. A cutting method that uses a cutting device to cut into the end of a sheet-like workpiece that runs continuously,
The cutting device is composed of at least two sets of cutter units,
The cutter unit includes a feed roll that rotates following the traveling of the sheet-like workpiece, and a cylindrical knife roll disposed at a position facing the feed roll via the sheet-like workpiece,
On the outer periphery of the knife roll, there are provided a blade portion for cutting a predetermined cut pattern at the end of the sheet-like workpiece, and a portion having no blade on the outer periphery,
A step of cutting a predetermined cut pattern at the edge of the sheet-like workpiece with one cutter unit;
A cutting method comprising a step of cutting a predetermined cut pattern in a place where the other workpiece unit is not cut or adding a cut. The cutting method according to claim 5 or 6, wherein the predetermined cut pattern is a convex shape.

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